You know, so many guys train so much that they neglect the most important part of the body: the brain. I know what you are talking about- guys that hit the bag, do the same combination over and over again, then stand and wait after they punch. They don't realize that you build habits that way. You always have to envision an opponent throwing punches back at you.

I saw this guy in Phoenix back in 04 that really caught my attention. He probably weighed 112 or 115 and he was kind of tall, working the heavy bag. He was watching himself real close in the mirror and working on a series of moves. He'd do them one at a time dissecting them until he was satisfied. Then he spent a couple rounds stringing these moves together, with head feints to get in, stepping around the bag, the whole shot. He really knew how to get the most out of a bag.